Soapstone deposits on the Belcher Islands are a product of intrusion of the Haig gabbro sills as ... more Soapstone deposits on the Belcher Islands are a product of intrusion of the Haig gabbro sills as part of 1960 ±160Ma plume-related volcanic events. Multiple sills intruded into wet sedimentary units underlying the Flaherty pillow basalts. Evidence of autohydration of sills include the uralitization and chloritization of pyroxene, epidotization, saussuritization and calcite replacement of plagioclase, and leucoxenization of ilmenite. Autohydration accompanied subsolidus cooling of 1000°C gabbro sills to under 400°C under low 2kbar pressure conditions.
The Kitto intrusion is a Mesoproterozoic 1117.7 ±1.8 Ma peridotitic to gabbroic intrusion, that f... more The Kitto intrusion is a Mesoproterozoic 1117.7 ±1.8 Ma peridotitic to gabbroic intrusion, that formed as a result of plume magmatism and was emplaced along Mesoproterozoic and Archean faults in the East Nipigon Embayment of northern Ontario. The plume signature for the Kitto intrusion is suggested by five samples with OIB (ocean island basalt)-like primitive mantle normalized multielement patterns in the lherzoliteolivine websterites.
Soapstone deposits on the Belcher Islands are a product of intrusion of the Haig gabbro sills as ... more Soapstone deposits on the Belcher Islands are a product of intrusion of the Haig gabbro sills as part of 1960 ±160Ma plume-related volcanic events. Multiple sills intruded into wet sedimentary units underlying the Flaherty pillow basalts. Evidence of autohydration of sills include the uralitization and chloritization of pyroxene, epidotization, saussuritization and calcite replacement of plagioclase, and leucoxenization of ilmenite. Autohydration accompanied subsolidus cooling of 1000°C gabbro sills to under 400°C under low 2kbar pressure conditions.
The Kitto intrusion is a Mesoproterozoic 1117.7 ±1.8 Ma peridotitic to gabbroic intrusion, that f... more The Kitto intrusion is a Mesoproterozoic 1117.7 ±1.8 Ma peridotitic to gabbroic intrusion, that formed as a result of plume magmatism and was emplaced along Mesoproterozoic and Archean faults in the East Nipigon Embayment of northern Ontario. The plume signature for the Kitto intrusion is suggested by five samples with OIB (ocean island basalt)-like primitive mantle normalized multielement patterns in the lherzoliteolivine websterites.
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